Remove SystemApi from android.permission.REQUEST_NETWORK_SCORES.

Copy/paste error, it's not needed.

Test: Built & run
Bug: 34250804
Change-Id: If9e0ff91e559bbcf278913cba47fd3d2073927b4
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 054fad2..da57bc3 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1272,7 +1272,7 @@
     <permission android:name="android.permission.SCORE_NETWORKS"
         android:protectionLevel="signature|privileged" />
 
-    <!-- @SystemApi Allows applications to request network
+    <!-- Allows applications to request network
          recommendations and scores from the NetworkScoreService.
          <p>Not for use by third-party applications. @hide -->
     <permission android:name="android.permission.REQUEST_NETWORK_SCORES"